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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cfe54b02bda3709671e49067393936557bedd4ce5f66e0743cb6296faec3ce' 
  AND token = 'nphXDpLd4ZPOZh0pnlBHYg2b7aS9EPmlPOvCqNSI+74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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