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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c246e7829bdc7c1f026a93b64a6cbe4c752d605d3c235675de6b9ddf7477ebfa' 
  AND token = 'NGHbpV6fE0H5sfjJodPnGO2x0uoxQIF1tUW9KX4cT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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