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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5800f746b5a97aa7b08eccaa7593cd0bf9b49bae1e14dde3ba7cad1d39c3c2b4' 
  AND token = 'tSsNCceSgenQnYjfT1IR8I2clO9Ls55BqWv9vvCqZVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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