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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce0f5517596783a022ef68783118c7dbcdb5a9bcfd1c5b1646e5011e3a06313' 
  AND token = 'AcDI+7XukInzaqsDNLyQ8Sr7udKh/tyzl5mnfuAH1wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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