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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a79287ede03d9501889466a81c7ee6b99879afdec3dd83d8c9c520766a56e4' 
  AND token = 'onuRy5RIxJQSN/KnQ9NZ7K9VIqttIB89CoE1ADvFDJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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