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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e67c5dc65aa478eff07d8c897e01292a00b7537471b72ac2c8181b4ae7ffac' 
  AND token = '6yBGiQYSTLjMgR65aKIYeMwtAZhX0pRipoYTS3fH/x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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