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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30ccd99a4b161eb13a4e1669af82cfa836adcb08d7d498f55516a6e329c839d' 
  AND token = 'HNQAxg9e/oeuZKsiPTKgC3JDLl+b0iF6L68QxQpFB1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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