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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f4cb3d965bc56317ac92a9c0199b7d0382c21c41d83beed7c03e988eeb5f7b' 
  AND token = 'sMwraJPapsdazWPi0/lXIUBD4hf2kQ7IWZ/Njj4ssi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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