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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2057f507eb78999351bbb5f14fd5bb45ae7baa723afc357317e7ba45c668a4' 
  AND token = 'RgM8tqdJey6I4G2MslwIs+B6e2o2iF4AI9ths6Tsyrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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