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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b82e668dc429e5463c78cb70b47bbeb0dd0a1533aa223b28d4e7b6948759cb4' 
  AND token = 'jfngEzwWTgV8kY0tA/Pavp3c7w/9Vx/SmI9ajueXa3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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