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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672cfc705d79ad5ac87be048205a99b0588e05b2e49e6d12d32d0a8f293a153b' 
  AND token = 'LwCMlliLcOcFEfGSUG11LDznnX/GBiy5ByHk12x5LAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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