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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b668c31558b46308acac912893fefd6183516d217da1d6fe241d3f0c48791fa3' 
  AND token = 'FfYVeQ1EwzVrPMlEKjwEwrz10UxdEY9oEZq804LJG4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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