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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ec6c024246a01674857826cd55939e8ca44e329d009cbe4e0ca84d92b966bf' 
  AND token = 'jRfeu9BDriFyWMC5u+0wWx4kl2v1buTar+rWdfwrSJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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