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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbba2253eb5e864bc71493bafd3616ca8ff7c4427cd30a91ceea94df05545d2' 
  AND token = 'om9wfCfKkRWgFG07ueVHyE6Toj5AnziUpPEt1t7YGbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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