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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61adb0df02e4d86c35798b6c462226262bbc73e921678cd3760274276df0a53' 
  AND token = '07+RsnAj5zijTNg9L3cCqCHTUo2O7ltrK4D+lxNBJLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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