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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2196c682de31c4c7b8cf5134ed68c0cbb6883bd8e6e683049ce3068e32a02c1' 
  AND token = 'AAk8L1Ia43DOCeF4n5asbXQI5AKyR0A7QooVhW8sdS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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