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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3218a5a78b409e22d8a67c1f9f98fc242a5d74547548b9cb87db48c540ccef44' 
  AND token = '08CcJkuM1xJj+ERNPNgRPZkwP9lCQ+gnymKKCBQknfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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