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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd118eef4090f46c6c1125772272463e48f8e85d43fcbc99e42555602aa6d28' 
  AND token = 'gw8RCkBOvFnNEz8baBTN7w/zELA5vcUdhNDDoOAx2IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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