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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfce748b36081587184a07e80017ac9cea0a2b8b97b6185251e63f16fed1c808' 
  AND token = 'L5P916KVwu6wJ6KhhJLppzxvEZ5abhpcvur+ra9V5kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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