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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d177388804c25995de0b0b83e78369c54b3f28f47dcfd26e72d114d3c4f90c0' 
  AND token = '2rm0OSIKl4yJDIAaaGXqbHWgAbTxndUPt/H4CwbDI9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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