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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f69171716698e7ddeccf76ba4a71aca92233360a9d140c7a6dd0cc371a9282' 
  AND token = '/xjqi6xeUuHZv31hvC+pYimFNf5YjCfkL8kajN1teb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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