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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47e46a0df1b3b307f94710d026b4d9f863c5ea3a7fea27b84ffb803a5ec6f2f' 
  AND token = 'Pi+3QWV9c6y23pgvPuTLC7aTzHFhb0hr2vLHt40XqWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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