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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a04c09f38361b78c0c33ee695cbfdd63b998f6989aee8fccc730d7f5d029f4' 
  AND token = 'kW2ensDF7R5/QjSaK9LxvVeovTYGnRfqx1tpuVTDR4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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