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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12df1f9347289b8bfa619da00551efaa2a719b328ca5e540fac2e8440818f41' 
  AND token = 'NUueye4Jh2KUCo/wO9bz7x8uQ7ycw9PpSGdh4YBcf2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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