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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a8c002b96f6455360a46586978fcb249b0fa946db8986f7200c704e7cf4e15' 
  AND token = 'O3+NkaOtZHbB6SC2190ZYqAXR3m+0gafwOybvctfQ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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