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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd007c9d680d69a7c0a4a266ac361c23b7e01649e4e739aa74b0ee5f60899c59' 
  AND token = '3I8YDoG1BbNNgaGkPdnTOFCMTOYUz8CG40WO6KNG6KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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