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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6a1b4017938072ee14849e5e24841ada420c7975f6ca3bf668113df5a5cad2' 
  AND token = 'wjrhp1wVE4jih16szDuw0RT5lAkRk+g1rBt8qneQhrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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