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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e660d2c672f64db299b26f683ff43630aebe9094ada4d5c924428c09612a623d' 
  AND token = 'V90FKvcDgOY13BQ4WtmTem6JH6rLTfFaJWtR/pRwNU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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