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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf60f44d657574e307e9f17ff0b05ea3753731da960f0eda6623d44682515f4b' 
  AND token = 'F7znp49xbJBawUiy/mXfbhPwcJ1pQzJFk0cW4BdZ2LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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