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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90afac1885d9df0b14a72c8df7a5b67454baff51592120598f1c09dfa622bf0' 
  AND token = 'KI66lpGNz0whbwiuYxXOiRPgiig6mgeLp6PoSv313fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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