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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7bca9ce4b195f8bc1c89c6b84838c5b5a6d178ccf8e29f504451c6d7b3c39a' 
  AND token = 'hLLfRU22uvS+3XFjz8nbxz2IguOlxmAiRPxsfeu5oYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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