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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd2be95d2ddcf0b556d2692b498b5b085a68beb1d86ca981b4e004b97e89992' 
  AND token = 'A+JFmA0QHcZ8fRNc4j0XbZp8wqHUcecnblXl5HmXFpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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