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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb5678629ee2866e7fac94d825ea0830a5dd665a561fccf4fabc4103e4caae6' 
  AND token = 'W8c261Ny3YxBwAGnx/YbdtwT8rvVBj557oLZ+yQ9HyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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