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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc91d9aa90f96cc464988d133056dad706d947bd503a276e5d0f11cec4913a75' 
  AND token = 'nmGWGnp8NEAD68cJiwcfZfNK/ktqOqRxyNmjl1e4xt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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