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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bc0203ce7ee330bdb8e5448e52ad3d23dcf70429cd139f28d841c934b57386' 
  AND token = 'JGcO6zGUiYtwrxS3F+iTok3UkoWvq0fEAwRKnbz1274=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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