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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18d215cd12ad7a2f5362d51d038d13ffcbaa355b208d7493bffd59941dd6f8d' 
  AND token = '30rOgEJDl6pAxTdFWuSyzmt1xbN29iklCViOE6P75+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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