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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd428a258c2e5746f8592a6f38261a2fab156166ed063c1e478b14ec6273d576' 
  AND token = 'vNGpCxFpCp2f+e1JYh18Dkgbhe/kDm4+rUgrxhwV5ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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