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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13973732bd96441135bf812a115808d40ccfd27ba0eea8eca7e661a81675f7cc' 
  AND token = 'IVK8/VODhXj3yPjnpuMnPoCxLN2dQFpo/SoVAhzFRt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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