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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3ea89663e142bbdc784bd3474f7c83c20827ef8806b9777fb2e89f8b484853' 
  AND token = '1deEXmNnNQfai6Zqn2cXhuK3UqsUJZ15jmIRkDbGDu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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