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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90460ebf8693a64f0d3c15b1f0381a6c851237438e6328fb717871e883a70882' 
  AND token = 'NpVEPv0w3Nzd9N9EKlHO5kVYPhAyNsN9FWhxCleWm/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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