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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5dee24e03dd2c4149ad74cc417559f27f8372b410381b021f57ca9dc0d8f4db' 
  AND token = 'WHFWqu+3ckLUC6z8iVzXrN9s0h+xq8AMQWCmRezm3xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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