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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a238f7df399c528d9d085c47be667cb2d1a0f028db94478004318c4270e7dbd' 
  AND token = '6yzlAofuFkBS0ev2Jyx+eM43LVkk3U8CGavHxqckDfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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