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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75077dfef0d257790093afcbd8017dd8651d65f6dd0dab3b8b7887d61ce5ec3' 
  AND token = 'HvNLzqX/huIoK94+cGVbTZin5qMshIpD8xtu6aOtbBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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