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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68caee7e300cf3ec2f07fe50169f504bc30c0ade2db10b9e4c6debb1681b3eb' 
  AND token = 'hurT+IAADZzzAh+z5exQs8VKCi/tsljURvueyB7qsYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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