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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e996cd349d27d2861ee1a8346bd1364d7bda12d45dc8d8b5c9ffcba000aca6e' 
  AND token = 'ad8Ev2DA65MFg2abEBSmC+9vW2pvMISM6p5y+VZNGiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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