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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e455ad80cfe50690884da2090c6d227ee2e3039542d2fe1888a68df1ed4884' 
  AND token = 'T7VeOXPF05wbqYrBkTi32rk+989DnQRiUtB3YT72wKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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