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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff324d8c2c41321b50617660c6ecf7ecc1eac71fda5796e7330d70a232d8e97' 
  AND token = 'PdiOGGvxel+UZ+/s0WdQu6qA5k7NV5jfH2Lu+E2Sg/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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