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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c89c0d6dfd6aa461787a86e6e102d490e013b259c1553f18cde3187e6363bc7' 
  AND token = 'Oh2W1pfN9XRViRZrG0QmVDq6CmulgGu2a8SgCRPArqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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