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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7120815b9e090c2592f0e30d7b847c2a71f2242cde53ece63fc4299d07cf3503' 
  AND token = 'L4HUDzvsrV3C4w4ldxV/rYSdqJ4KtY3y38Z71wQCLtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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