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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f71e6116d07584b8c36be13e50f7677460fafc504fc06c9fb5abda13e5b1a08' 
  AND token = 'cjYxQLu/kPmaM/8Na8aIGe0dDyi9Us+kmmd8nKNdq/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}