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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22a0ae35b156fb722a92f7369d2c604d3d514bf3c2ccc43faa5a5c832ef342b' 
  AND token = '2w/GKmxo4MqtHUtrTplaXQjC07MZKyOiyELhtB6li7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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