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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca30bde01ab1541b61a33a4db321e5b7cf7eb6d7e8d4c86e262d6c8352b2664' 
  AND token = 'Donk67xBi/Dqe5Uta4NuVe9BvIhyteXF5lfNy1ZazAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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