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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd847c8f249ae67325f463afb5c9d89a6985fe1d2d428818d52cdb1349e3c1c' 
  AND token = '08qOEeA0etsokXCC0y8Caf844DchSqqNeck56HRT4DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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