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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33253f07974b037814841f3c61647832b791e567d3bf373830e59921aab5f003' 
  AND token = 'FeoUtUb6zs0Hon8v+1YOtmYwzhpm7S7tostsTgCWXJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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