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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312895e00db78e2e6e1f2ed3bc7e1a72eb2bfdcc3eb3af5bfa6700af8c731df7' 
  AND token = 'ZMrP4CuGzOXBHP+Eh0ihLMok/u0EVOu9ff1475owVMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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