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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dcf7742de56cb532d98c2485c023e2f856f212a7c0d4dd85d1ea329be7dbe8' 
  AND token = 'fISUzliYFRWwCl9bRut5cxG88ki8idfC8HyNA3GUaOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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