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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a28080c66629734a7e88f915c4e61bfb94e10faef0ff4c0faa291980269293' 
  AND token = 'c5KUyIaPUvenBLJ9dvyugGXbv3iPd1tOSKsm1voSkPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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