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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd9d1fb933a5dbf47167ef2464240f00828f54ff6cb603375d3639852e2adc' 
  AND token = 'lWyog5HPaf1EdlFXJ/ILctohm3+Ob4mNy2LJBOboYtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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