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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b795fb5b0f9a7b95e5522aaa47cb8537b712cd740fa7a3ef53ba56d0af755847' 
  AND token = 'xUO47bo1GwrTjr0b+qD8n9xyPfv3u8uOmDvH7OkRB6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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